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Old 08-29-2005, 10:47 PM   #1
Jakes-66-K10
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Fuel sender removal?

I've gone through the FAQs and the Google Search. How do you remove the sender unit from the gas tank? Do you have to have a special tool or can you remove it by other means?
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Old 08-29-2005, 11:08 PM   #2
pjmoreland
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It's held in by a weird lock ring with tabs sticking off of it. I just use a large flat blade screwdriver and a hammer to tap on the tabs to drive the lock ring counterclockwise. You usually have to alternate tabs to keep the ring spinning. It only has to rotate maybe a quarter of a turn before it will pop free.
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Old 08-29-2005, 11:18 PM   #3
cdowns
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yeah what he said/ it's sealed to the tank with an oring and it's best to get a new one when reinstalling the sender unit
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Old 08-29-2005, 11:35 PM   #4
sneakysnake
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This is the ring part that moves.
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Old 08-30-2005, 12:18 AM   #5
garold99
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Is this what you have to replace if your fuel gauge is stuck on Empty? Other than fuel that is ha ha.
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Old 08-30-2005, 12:55 AM   #6
Jakes-66-K10
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Awesome, thanks guys. Got it off. I've fixed my gauge on my '66 GMC before by removing the sender and noticing the wire on the sender was broken. I was hoping that was the case on this '70 sender, but everything checks out OK. I checked continuity between the sender box and the top where it attaches to the wire. But when I put my key into "on" position the gauge went all the way down like it should, then way up past Full and just sits there now. Moving the float does nothing.

Any ideas? What's the best way to determine if the gauge or the sender is the culprit?
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Old 08-30-2005, 05:11 AM   #7
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Check the ohms on the sender with the float down and all the way up. Should go from near zero to 90 ohms resistence. Dont ask me if anything needs grounding.
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Old 08-30-2005, 11:58 AM   #8
sneakysnake
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The sending unit is a variable resister to ground. If your needle is moving chances are your gauge is good. To check your sender with the wire removed ohm between the wire connection and the base metal, move the float up and down to change the reading 0-90 if nothing happens then you have an open circuit. Replace sender.
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Old 08-30-2005, 12:36 PM   #9
70c10
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When you take the ring off and reinstall you should use a block of wood to tap on instead of the screwdriver to prevent any chance of a spark.
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